Hi Edwin,
I wrote you 2 places where to look for the example. I do not know what kind of customer you are. As far as I know, in the Forum you should expect answers only from other Community members and Sorry if you do not like my responses. if you are a paid customer, the support is by e-mail as you probably know. In addition, when you go to the link which you posted, you can simply right-click with your mouse and click “View Source” to see the demo’s source. The exact path to that Demo in the Demos section is: jqxGrid>Editing>Custom DropDownList Column. Btw, there are other demos about Foreign Columns which you can find when you expand the Columns section. Hope you will find them – Foreign Key Column and Keys/Values Column.
Best Regards,
Peter Stoev
jQWidgets Team
http://www.jqwidgets.com